<template>
<div>
  <div class="shopcart">
    <div class="content" @click="toggleList">
      <div class="content-left">
        <div class="logo-wrapper">
          <div class="logo" :class="{'highlight':totalCount>0}">
            <i class="iconfont icon-gouwuchekong" :class="{'highlight':totalCount>0}"></i>
          </div>
          <div class="num" v-show="totalCount>0">{{totalCount}}</div>
        </div>
        <div class="no-price" v-if="totalCount <= 0">购物车空</div>
        <div class="desc" v-else>商品合计: <span>￥{{totalPrice}}</span></div>
      </div>
      <div class="content-right" @click.stop.prevent="pay">
        <div class="pay" :class="payClass">
          结算
        </div>
      </div>
    </div>
    <div class="ball-container">
      <div v-for="ball in balls">
        <transition name="drop" @before-enter="beforeDrop" @enter="dropping" @after-enter="afterDrop">
          <div class="ball" v-show="ball.show">
            <div class="inner inner-hook"></div>
          </div>
        </transition>
      </div>
    </div>
    <transition name="fold">
      <div class="shopcart-list" v-show="listShow">
        <div class="list-header">
          <h1 class="title">购物车</h1>
          <span class="empty" @click="empty">清空</span>
        </div>
        <div class="list-content" ref="listContent">
          <ul>
            <li class="food" v-for="food in selectFoods">
              <span class="name">{{food.name}}</span>
              <div class="price">
                <span>￥{{food.price*food.count}}</span>
              </div>
              <div class="cartcontrol-wrapper">
                <cartcontrol @add="addFood" :food="food"></cartcontrol>
              </div>
            </li>
          </ul>
        </div>
      </div>
    </transition>
  </div>
  <transition name="fade">
    <div class="list-mask" @click="hideList" v-show="listShow"></div>
  </transition>
</div>
</template>

<script type="text/ecmascript-6">
import BScroll from 'better-scroll'
import cartcontrol from './cartcontrol.vue'
import '../../../styles/font/iconfont'

export default {
  props: {
    selectFoods: {
      type: Array,
      default () {
        return [{
          price: 10,
          count: 1
        }]
      }
    },
    deliveryPrice: {
      type: Number,
      default: 0
    },
    minPrice: {
      type: Number,
      default: 0
    }
  },
  data () {
    return {
      balls: [{
        show: false
      },
      {
        show: false
      },
      {
        show: false
      },
      {
        show: false
      },
      {
        show: false
      }
      ],
      dropBalls: [],
      fold: true
    }
  },
  computed: {
    totalPrice () {
      let total = 0
      this.selectFoods.forEach((food) => {
        total += food.price * food.count
      })
      return total
    },
    totalCount () {
      let count = 0
      this.selectFoods.forEach((food) => {
        count += food.count
      })
      return count
    },
    payDesc () {
      if (this.totalPrice === 0) {
        return `￥${this.minPrice}元起送`
      } else if (this.totalPrice < this.minPrice) {
        let diff = this.minPrice - this.totalPrice
        return `还差￥${diff}元起送`
      } else {
        return '去结算'
      }
    },
    payClass () {
      if (this.totalPrice === 0) {
        return 'not-enough'
      } else {
        return 'enough'
      }
    },
    listShow () {
      if (!this.totalCount) {
        this.fold = true
        return false
      }
      let show = !this.fold
      if (show) {
        this.$nextTick(() => {
          if (!this.scroll) {
            this.scroll = new BScroll(this.$refs.listContent, {
              click: true
            })
          } else {
            this.scroll.refresh()
          }
        })
      }
      return show
    }
  },
  methods: {
    drop (el) {
      for (let i = 0; i < this.balls.length; i++) {
        let ball = this.balls[i]
        if (!ball.show) {
          ball.show = true
          ball.el = el
          this.dropBalls.push(ball)
          return
        }
      }
      console.log('drop')
    },
    toggleList () {
      if (!this.totalCount) {
        return
      }
      this.fold = !this.fold
    },
    hideList () {
      this.fold = true
    },
    empty () {
      this.selectFoods.forEach((food) => {
        food.count = 0
      })
    },
    pay () {
      if (this.totalPrice < this.minPrice) {
        return
      }
      window.alert(`支付${this.totalPrice}元`)
    },
    addFood (target) {
      this.drop(target)
    },
    beforeDrop (el) {
      let count = this.balls.length
      while (count--) {
        let ball = this.balls[count]
        if (ball.show) {
          let rect = ball.el.getBoundingClientRect()
          let x = rect.left - 32
          let y = -(window.innerHeight - rect.top - 22)
          el.style.display = ''
          el.style.webkitTransform = `translate3d(0,${y}px,0)`
          el.style.transform = `translate3d(0,${y}px,0)`
          let inner = el.getElementsByClassName('inner-hook')[0]
          inner.style.webkitTransform = `translate3d(${x}px,0,0)`
          inner.style.transform = `translate3d(${x}px,0,0)`
        }
      }
    },
    dropping (el, done) {
      /* eslint-disable no-unused-vars */
      let rf = el.offsetHeight
      this.$nextTick(() => {
        el.style.webkitTransform = 'translate3d(0,0,0)'
        el.style.transform = 'translate3d(0,0,0)'
        let inner = el.getElementsByClassName('inner-hook')[0]
        inner.style.webkitTransform = 'translate3d(0,0,0)'
        inner.style.transform = 'translate3d(0,0,0)'
        el.addEventListener('transitionend', done)
      })
    },
    afterDrop (el) {
      let ball = this.dropBalls.shift()
      if (ball) {
        ball.show = false
        el.style.display = 'none'
      }
    }
  },
  components: {
    cartcontrol
  }
}
</script>

<style lang="scss" >
.shopcart {
    position: fixed;
    left: 0;
    bottom: 0;
    z-index: 50;
    width: 100%;
    height: 1.33rem;
    .content {
        display: flex;
        background: #faf9f9;
        font-size: 0;
        color: rgba(255, 255, 255, 0.4);
        .content-left {
            flex: 1;
            .logo-wrapper {
                display: inline-block;
                vertical-align: top;
                position: relative;
                top: -.35rem;
                margin: 0 0.39rem 0.09rem;
                padding: 0.08rem;
                width: 1.5rem;
                height: 1.5rem;
                box-sizing: border-box;
                border-radius: 50%;
                background: #ffffff;
                border: solid 1px #e5e5e5;
                .logo {
                    width: 100%;
                    height: 100%;
                    border-radius: 50%;
                    text-align: center;
                    background: #ffffff;
                    &.highlight {
                        background: #ffffff;
                    }
                    .icon-gouwuchekong {
                        line-height: 1.3rem;
                        font-size: .8rem;
                        color:  #BFBFBF;
                        &.highlight {
                            color:  #ffad36;
                        }
                    }
                }
                .num {
                    position: absolute;
                    top: 0;
                    right: 0;
                    width: .48rem;
                    height: .48rem;
                    line-height: .48rem;
                    text-align: center;
                    border-radius: .48rem;
                    font-size: .4rem;
                    font-weight: 700;
                    color: #fff;
                    background: rgb(240, 20, 20);
                    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.4);
                }
            }

            .no-price {
                display: inline-block;
                // vertical-align: middle;
                margin-top: .42rem;
                margin-left: .13rem;
                padding-right: 12px;
                box-sizing: border-box;
                border-right: 1px solid rgba(255, 255, 255, 0.1);
                font-size: .4rem;
                // font-weight: 700;
                color: #BFBFBF;
            }
            .desc {
                display: inline-block;
                // vertical-align: middle;
                // margin: .55rem 0 0 2.4rem;
                margin-top: .42rem;
                margin-left: 2rem;
                line-height: 0.53rem;
                font-size: 0.35rem;
                color: #909090;
                span {
                    font-size: 0.41rem;
                    letter-spacing: 0;
                    color: #ff4e6c;
                }
            }
        }
        .content-right {
            flex: 0 0 2.6rem;
            width: 2.61rem;
            .pay {
                height: 1.33rem;
                line-height: 1.33rem;
                text-align: center;
                font-size: .4rem;
                font-weight: 700;
                &.not-enough {
                    background-color: #BFBFBF;
                    color: #fff;
                }
                &.enough {
                  background-image: linear-gradient(90deg, #fcd69e 0%, #ffac33 100%), linear-gradient(#ffac33, #ffac33);
                  background-blend-mode: normal, normal;
                }
            }
        }
        .ball-container {
            .ball {
                position: fixed;
                left: 32px;
                bottom: 22px;
                z-index: 200;
                transition: all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41);
                .inner {
                    width: 16px;
                    height: 16px;
                    border-radius: 50%;
                    background: rgb(0, 160, 220);
                    transition: all 0.4s linear;
                }
            }
          }
        }
        .shopcart-list {
            position: absolute;
            left: 0;
            top: 0;
            z-index: -1;
            width: 100%;
            transform: translate3d(0, -100%, 0);
            &.fold-enter-active,
            &.fold-leave-active {
                transition: all 0.5s;
            }
            &.fold-enter,
            &.fold-leave-active {
                transform: translate3d(0, 0, 0);
            }
            .list-header {
                height: 40px;
                line-height: 40px;
                padding: 0 18px;
                background-color: #cfcfcf;
                 .title {
                    float: left;
                    font-size: .43rem;
                    color: #535353;
                }
                .empty {
                    float: right;
                    font-size: .37rem;
                    color: #949494;
                }
            }
            .list-content {
                padding: 0 18px;
                max-height: 217px;
                overflow: hidden;
                background: #fff;
                .food {
                    position: relative;
                    padding: 12px 0;
                    box-sizing: border-box;
                    // border-1px(rgba(7, 17, 27, 0.1));
                    .name {
                      line-height: .48rem;
                      font-size: .4rem;
                      color: rgb(7, 17, 27);
                    }
                    .price {
                        position: absolute;
                        right: 2.4rem;
                        bottom: .27rem;
                        line-height: .48rem;
                        font-size: .4rem;
                        font-weight: 700;
                        // color: rgb(240, 20, 20);
                    }
                    .cartcontrol-wrapper {
                        position: absolute;
                        right: 0;
                        bottom: .35rem
                    }
                }
            }
        }
    .list-mask {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: 40;
        // backdrop-filter: blur(10px);
        opacity: 1;
        background: rgba(7, 17, 27, 0.6);
        &.fade-enter-active,
        &.fade-leave-active {
            transition: all 0.5s;
        }
        &.fade-enter,
        &.fade-leave-active {
            opacity: 0;
            background: rgba(7, 17, 27, 0);
        }
    }
}
</style>
